As defined in Power 3.0 section 4.4.4 "Underflow Exception",
a tiny result is detected before rounding.
Fixes: https://bugs.launchpad.net/qemu/+bug/
1841491
Reported-by: Paul Clarke <pc@us.ibm.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <
20190827020013.27154-1-richard.henderson@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
s->exception_index = POWERPC_EXCP_NONE;
env->error_code = 0;
+ /* tininess for underflow is detected before rounding */
+ set_float_detect_tininess(float_tininess_before_rounding,
+ &env->fp_status);
+
for (i = 0; i < ARRAY_SIZE(env->spr_cb); i++) {
ppc_spr_t *spr = &env->spr_cb[i];